Barn owl project overview

CAM VALLEY WILDLIFE GROUP BARN OWL PROJECT

The project started in 1994 when Barn owls were under severe threat garynationally and thought to be extinct as a breeding species in what at the time was the county of Avon. A nationwide Project Barn owl was launched and we agreed to pick it up in Cam Valley Wildlife Group area. The area covers approximately 300 sq km around Midsomer Norton, Radstock and surrounding villages in Somerset. We immediately located one nesting pair. We also started to call on local farmers to gain agreement to erect boxes. Initially we put them in trees but that was not very successful. Boxes were rotted by the rain and pigeons and jackdaws used the boxes. We then switched the focus to barns of which we are fortunate to have lots in our area. Over the years the project has grown and we adopted a strategy of mass coverage – getting boxes in as many barns in suitable habitat areas as we b-owl_in-flight3could. We never expected all of them, nor even the majority, to be occupied but our intention was to maximise the nesting opportunity for Barn owls. Our database now includes over 150 sites mainly nest boxes in barns and a few in trees but also other sites, of wide variety, which we found have been used as nest sites at some time during the project. These include: hollow trees, a church, water tower, grain silo, house lofts and an old pit winding gear tower. All sites on the database are monitored each year to determine which are occupied. When we find that a pair is present and breeding we then return at a later date to count the number of chicks.

We operate very much on a least disturbance basis. This involves determining, by distant observation, which sites are occupied and looking for signs such as the pellets which are coughed up and white splashing. When a site is occupied we return to watch a few times to determine if there is a breeding pair, the male will be seen taking prey into the nest. The next visits are to listen for the sound of chicks which emit a loud “snoring” call, especially when the adults bring in food. After that we try to pay just a single visit to inspect the nest and count the number of chicks.

b-owlbreedingchart5The chart tracks the growth of nesting pairs found year by year since 1995. It does not reflect fully the number of nesting pairs in the area as there are bound to be at least a few undetected pairs. It does however give a good idea indication of how the population has grown since the project started. The figures for 2001 & 2006 are artificially low because outbreaks of Foot & Mouth and BSE restricted the number of farm sites we could visit. The low figure in 2013 reflects an 80% national failure rate of breeding Barn owls.

Barn owls are afforded protection under the Wildlife & Countryside Act which makes it illegal to disturb them during the nesting period without a licence which we obtain from Natural England.

If you want to know more or would like to consider getting involved in the project then please contact Andre Fournier on 01761 418153

Photographs by courtesy of team member Gary Kingman